EP4250623A2 - Vorrichtung und verfahren zum erhalten von symboltaktzeitsynchronisation, die robust gegenüber frequenzversatz bei der zellensuche in einem drahtloskommunikationssystem ist - Google Patents

Vorrichtung und verfahren zum erhalten von symboltaktzeitsynchronisation, die robust gegenüber frequenzversatz bei der zellensuche in einem drahtloskommunikationssystem ist Download PDF

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Publication number
EP4250623A2
EP4250623A2 EP23186435.6A EP23186435A EP4250623A2 EP 4250623 A2 EP4250623 A2 EP 4250623A2 EP 23186435 A EP23186435 A EP 23186435A EP 4250623 A2 EP4250623 A2 EP 4250623A2
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EP
European Patent Office
Prior art keywords
synchronization
sequence
base sequence
carrier
sub
Prior art date
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Pending
Application number
EP23186435.6A
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English (en)
French (fr)
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EP4250623A3 (de
Inventor
Kapseok Chang
Young-Hoon Kim
Seong Rag Kim
Seuck Ho Won
Keun Young Kim
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Publication of EP4250623A2 publication Critical patent/EP4250623A2/de
Publication of EP4250623A3 publication Critical patent/EP4250623A3/de
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2681—Details of algorithms characterised by constraints
    • H04L27/2684—Complexity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J2011/0096—Network synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation

Definitions

  • the present invention relates to a cell search apparatus and method of obtaining symbol synchronization of a wireless communication system, and discloses an apparatus and a method of generating and assigning a sequence for obtaining symbol synchronization, the apparatus and method being robust to a frequency offset.
  • a first action that a mobile station performs is obtaining symbol synchronization to perform initial access to a predetermined wireless communication system.
  • the present invention relates to the obtaining of the symbol synchronization.
  • a transmitting base station assigns a single base sequence to a frequency resource available in a frequency area of a synchronization channel, and a receiving mobile station measures a correlation value between a time area signal of the synchronization channel and a received signal of the time area and regards a sample time having a highest correlation value as a symbol synchronization time.
  • OFDM orthogonal frequency division multiplexing
  • a size of the base sequence is required to be regular.
  • performance of obtaining synchronization is also deteriorated in the environment where the frequency offset is high.
  • An aspect of the present invention provides a symbol synchronization obtaining apparatus robust to a frequency offset in a cell search of a wireless communication system that combines a base sequence and a sequence modified based on the base sequence to generate a synchronization pattern for obtaining symbol synchronization, and assigns the synchronization pattern to a synchronization channel, thereby efficiently estimating symbol synchronization in an environment having a relatively high frequency offset and preventing increase of a peak to average power ratio (PAPR) of a transmitting apparatus.
  • PAPR peak to average power ratio
  • Another aspect of the present invention also provides a symbol synchronization obtaining apparatus robust to a frequency offset in a cell search of a wireless communication system that combines a base sequence and a sequence modified based on the base sequence to generate a synchronization pattern for obtaining symbol synchronization, and assigns the synchronization pattern to a synchronization channel, thereby efficiently estimating symbol synchronization and reducing a complexity of a receiving apparatus, even though a PAPR increases by a small amount.
  • an apparatus of transmitting a symbol synchronization by obtaining the symbol synchronization including a sequence generator to generate a base sequence used for obtaining the symbol synchronization, a synchronization pattern generator to generate a modified sequence based on the base sequence and to generate a synchronization pattern by combining the modified sequence and the base sequence, a frequency mapping unit to perform mapping of transmission information to a time area and a frequency area, based on the synchronization pattern, for generating a transmission frame, and a transmitting unit to transmit the transmission frame.
  • the synchronization pattern generator may perform complex-conjugation of an element of the base sequence to generate the modified sequence.
  • the synchronization pattern generator may multiply an element of the base sequence by '-1' to generate the modified sequence.
  • the synchronization pattern generator may multiply an element of a complex-conjugated base sequence by '-1' to generate the modified sequence.
  • a method of transmitting a symbol synchronization by obtaining the symbol synchronization including generating a base sequence used for obtaining the symbol synchronization, generating a modified sequence based on the base sequence, generating a synchronization pattern by combining the modified sequence and the base sequence, generating a transmission frame by mapping transmission information to a time area and a frequency area based on the synchronization pattern, and transmitting the transmission frame.
  • Example embodiments of the present invention combine a base sequence and a sequence modified based on the base sequence to generate a synchronization pattern for obtaining symbol synchronization, and assign the synchronization pattern to a synchronization channel, thereby efficiently estimating symbol synchronization in an environment having a relatively large frequency offset and preventing an increase of a peak to average power ratio (PAPR) of a transmitting apparatus.
  • PAPR peak to average power ratio
  • example embodiments of the present invention combine a base sequence and a sequence modified based on the base sequence to generate a synchronization pattern for obtaining symbol synchronization, and assign the synchronization pattern to a synchronization channel, thereby efficiently estimating symbol synchronization and reducing a complexity of a receiving apparatus, even though a PAPR increases by a small amount.
  • FIG. 1 is a recapitulative diagram illustrating a symbol synchronization obtaining and transmitting apparatus robust to a frequency offset in a cell search of a wireless communication system according to an embodiment of the present invention.
  • a sequence generator 101 generates a base sequence for obtaining symbol synchronization
  • a Pattern Generator in FIG. 1 ] 102 generates a modified sequence based on the base sequence and combines the modified sequence and the base sequence to generate a synchronization pattern
  • a frequency mapping unit 103 performs mapping of transmission information to be transmitted to the synchronization pattern to a time area and a frequency area to generate a transmission frame
  • a transmitting unit 104 transmits the transmission frame.
  • the base sequence for obtaining a time synchronization generated by the sequence generator 101 may be a binary sequence or a complex-sequence, and the sequence generator 101 may generate a sequence for identifying a cell group/cell/frame synchronization.
  • the synchronization pattern generator 102 may generate the synchronization pattern of a synchronization channel using the sequence for identifying the cell group/cell/frame synchronization. In this instance, the synchronization pattern generator 102 may generate a pilot pattern of a downlink signal that assigns, to a pilot channel, a unique scrambling sequence that is assigned for each cell for encoding a common pilot symbol and data symbol in a cellular system.
  • the synchronization pattern generator 102 may variously set a ratio between the base sequence and the modified sequence included in the synchronization pattern, for generating the synchronization pattern.
  • the synchronization pattern generator 102 may set the ratio between the base sequence and the modified sequence included in the synchronization pattern to 1:1, thereby enabling the base sequence to use half a frequency resource that is used by the synchronization channel for estimating the symbol synchronization, the synchronization channel being included in the transmission frame, or may assign 1/m of the frequency resource to the base sequence and assign remaining frequency to the modified sequence.
  • m may be an integer equal to or greater than two.
  • the synchronization pattern generator 102 may apply various methods to the base sequence to generate the modified sequence.
  • the synchronization pattern generator 102 may perform complex-conjugation of an element of the base sequence to generate the modified sequence, may multiply the element of the base sequence by '-1' to generate the modified sequence, and may multiply the element of the complex-conjugated base sequence by '-1' to generate the modified sequence.
  • FIGS. 2 through 7 describe that a sequence element is assigned to a DC sub-carrier, the description is only an example and it is kept in mind that the sequence element cannot be assigned to the DC sub-carrier, or the assigned value of the DC sub-carrier can be set to be zero even though a sequence element is assigned to the DC sub-carrier.
  • the frequency mapping unit 103 may generate a transmission frame in a form of a downlink frame by mapping of the transmission information to a time area and a frequency area using the synchronization pattern and the pilot pattern generated from the synchronization pattern generator 102 and transmission traffic data and frame control information transmitted from an outside.
  • the frequency mapping unit 103 may assign the synchronization pattern generated from the synchronization pattern generator 102 to the synchronization channel.
  • the frequency mapping unit 103 may set a size pattern of a time area signal of a synchronization channel symbol section not to be a flat shape, the synchronization channel symbol section being a section where the transmission information is mapped to the time area and the frequency area.
  • the transmitting unit 104 may receive the transmission frame from the frequency mapping unit 103 and may transmit the received transmission frame via a transmission antenna.
  • the transmitting unit 104 may be an orthogonal frequency division multiplexing (OFDM) transmitter.
  • FIG. 2 is a diagram illustrating a state where a sequence element is assigned to a transmission frame according to a synchronization pattern generated, according to a first example embodiment.
  • the synchronization pattern generated according to a first example embodiment of the present invention may assign a Zadoff-Chu (ZC) sequence b V (k) having N P as a prime number, as a base sequence b V (k) 201, to an upper sub-carrier for transmitting a synchronization channel.
  • ZC Zadoff-Chu
  • the base sequence b V (k) 201 may be calculated based on Equation 1 as given below.
  • k 0,1 , ... , N P ⁇ 1
  • V indicates a sequence index
  • N P indicates a length of a sequence for obtaining symbol synchronization
  • N indicates a total frequency resource used by the synchronization channel.
  • the synchronization pattern generated according to the first example embodiment of the present invention may assign b V ⁇ (k) 202 generated by conjugating (' ⁇ ') the base sequence b V (k) 201 as a modified sequence c V (k) to a lower sub-carrier for transmitting the synchronization channel.
  • the modified sequence c V (k) may be calculated based on Equation 2 as given below.
  • N G indicates a prime number of a complex-sequence, and N may or may not be identical to N G .
  • FIG. 3 is a diagram illustrating a state where a sequence element is assigned to a transmission frame according to a synchronization pattern generated, according to a second example embodiment
  • the synchronization pattern generated according to the second example embodiment of the present invention may assign a base sequence b V (k) 301 calculated according to Equation 1 to an upper sub-carrier for transmitting a synchronization channel, and assign - b V (k) 302 generated by multiplying the base sequence b V (k) 301 by '-1' as a modified sequence c V (k) to a lower sub-carrier for transmitting the synchronization channel.
  • the modified sequence c V (k) may be calculated based on Equation 3 as given below.
  • FIG. 4 is a diagram illustrating a state where a sequence element is assigned to a transmission frame according to a synchronization pattern generated, according to a third example embodiment.
  • the synchronization pattern generated according to the third example embodiment of the present invention may assign a base sequence b V (k) 401 calculated according to Equation 1 to an upper sub-carrier for transmitting a synchronization channel, and assign - b V (k) 402 generated by multiplying a conjugated base sequence b V (k) 401 by '-1' as a modified sequence c V (k) to a lower sub-carrier for transmitting the synchronization channel.
  • the modified sequence c V (k) may be calculated based on Equation 4 as given below.
  • FIG. 5 is a diagram illustrating a state where a sequence element is assigned to a transmission frame according to a synchronization pattern generated, according to a fourth example embodiment.
  • the synchronization pattern generated according to the fourth example embodiment of the present invention may assign a Zadoff-Chu (ZC) sequence b V (k) having N P as a prime number, as a base sequence b V (k) 501, to an even-numbered positioned sub-carrier for transmitting a synchronization channel.
  • the base sequence b V (k) 501 may be calculated based on Equation 5 as given below.
  • the synchronization pattern generated according to the fourth example embodiment of the present invention may assign b V ⁇ (k) 502 generated by conjugating (' ⁇ ') the base sequence b V (k) 501 as a modified sequence c V (k) to an odd-numbered positioned sub-carrier for transmitting the synchronization channel.
  • the modified sequence c V (k) may be calculated based on Equation 6 as given below.
  • FIG. 6 is a diagram illustrating a state where a sequence element is assigned to a transmission frame according to a synchronization pattern generated, according to a fifth example embodiment.
  • the synchronization pattern generated according to the fifth example embodiment of the present invention may assign a base sequence b V (k) 601 calculated according to Equation 5 to an even-numbered positioned sub-carrier for transmitting a synchronization channel, and assign - b V (k) 602 generated by multiplying the base sequence b V (k) 601 by '-1' as a modified sequence c V (k) to an odd-numbered positioned sub-carrier for transmitting the synchronization channel.
  • the c V (k) 602 is calculated based on Equation 7 as given below.
  • FIG. 7 is a diagram illustrating a state where a sequence element is assigned to a transmission frame according to a synchronization pattern generated, according to a sixth example embodiment.
  • the synchronization pattern generated according to the sixth example embodiment of the present invention may assign a base sequence b V (k) 701 calculated according to Equation 5 to an even-numbered positioned sub-carrier for transmitting a synchronization channel, and assign b V ⁇ (k) 702 generated by conjugating (' ⁇ ') the base sequence b V (k) 701 as a modified sequence c V (k) to an odd-numbered positioned sub-carrier for transmitting the synchronization channel.
  • the c V (k) 702 is calculated based on Equation 8 as given below.
  • FIG. 8 is a diagram illustrating an example of a size pattern of a time area signal of a synchronization channel symbol section that is generated from a transmitting apparatus.
  • 2 ) 801, 802, and 803 of a time area signal ( d(n)) in the second example embodiment and the fifth example embodiment.
  • n may be a sample time index.
  • the waveform 801 of the conventional symbol synchronization estimating method has a flat envelope during a synchronization channel symbol section
  • the waveform 802 of the second embodiment is a concave shape
  • the waveform 803 of the fifth embodiment is a convex shape.
  • the frequency mapping unit 103 may use a setup for adjusting a matching position, thereby enabling the power waveform not to be flat similar to the waveform 801 of the conventional symbol synchronization estimating method.
  • the frequency mapping unit 103 may set the power waveform to form a convex form, a concave form, or an asymmetric pattern.
  • FIG. 9 is a recapitulative diagram illustrating a symbol synchronization obtaining and receiving apparatus 900 robust to a frequency offset in a cell search of a wireless communication system according to an embodiment of the present invention.
  • a receiving unit 901 receives a transmission frame
  • a filtering unit 902 performs filtering of the transmission frame by a same amount of bandwidth assigned to a synchronization channel
  • a time area correlation unit 903 performs correlation between a time area signal of a synchronization channel symbol section stored in advance and a received sample time signal included in the transmission frame to calculate a correlation value of each sample time
  • the symbol synchronization detector 904 determines a sample time having a highest correlation value as the symbol synchronization.
  • Equation 9 when it is assumed that the transmission frame received by the receiving unit 901 has no fading and only has additional noise, the received transmission frame is expressed as Equation 9 as given below.
  • d(n) is a time area signal
  • r(n) is the received transmission frame
  • w(n) is additional noise
  • ⁇ f is a frequency offset
  • the time area correlation unit 903 may calculate the correlation value of each sample time based on Equation 10 assuming the symbol synchronization sample time is a complete symbol synchronization sample time.
  • FIG. 10 is a flowchart illustrating a symbol synchronization obtaining and transmitting method robust to a frequency offset in a cell search of a wireless communication system according to an embodiment of the present invention.
  • the sequence generator 101 In operation S1001, the sequence generator 101 generates a base sequence for obtaining a symbol synchronization.
  • the pattern generator 102 In operation S1002, the pattern generator 102 generates a modified sequence based on the base sequence generated in operation S1001.
  • the pattern generator 102 combines the base sequence generated in the operation S1001 and the modified sequence generated in operation S1002 to generate a synchronization pattern.
  • the frequency mapping unit 103 performs mapping transmission information to a time area and a frequency area based on the synchronization pattern generated in operation S1003, for generating a transmission frame.
  • the frequency mapping unit 103 may set a size pattern of a time area signal of a synchronization channel symbol section included in the transmission frame not to be flat, for generating the transmission frame.
  • the transmitting unit 104 transmits the transmission frame generated in operation S1004.
  • FIG. 11 is a flowchart illustrating a symbol synchronization obtaining and receiving method robust to a frequency offset in a cell search of a wireless communication system according to an embodiment of the present invention.
  • the receiving unit 901 receives a transmission frame transmitted from the transmitting unit 104.
  • the filtering unit 902 performs filtering of the received transmission frame received in operation S1101 by a same amount of bandwidth assigned to a synchronization channel.
  • a time area correlation unit 903 performs correlation between a time area signal of a synchronization channel symbol section stored in advance and the received transmission frame filtered in operation S1002, for calculating a correlation value of each sample time.
  • the symbol synchronization detector 104 determines a sample time having a highest correlation value calculated in operation S1 103, as the symbol synchronization.
  • the symbol synchronization obtaining apparatus robust to a frequency offset in a cell search of a wireless communication system combines a base sequence and a sequence modified based on the base sequence to generate a synchronization pattern for obtaining symbol synchronization, assigns the synchronization pattern to a synchronization channel, thereby efficiently estimating symbol synchronization and reducing a complexity of a receiving apparatus, even though a PAPR increases by a small amount.
EP23186435.6A 2008-05-09 2009-05-08 Vorrichtung und verfahren zur erzielung einer gegenüber frequenzversatz robusten symbolzeitsynchronisation bei der zellensuche eines drahtlosen kommunikationssystems Pending EP4250623A3 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
KR20080043423 2008-05-09
KR1020080130231A KR101231512B1 (ko) 2008-05-09 2008-12-19 무선통신시스템의 셀 탐색에서 주파수 오프셋에 강한 심볼 동기 획득 장치 및 방법
PCT/KR2009/002422 WO2009136753A2 (ko) 2008-05-09 2009-05-08 무선통신시스템의 셀 탐색에서 주파수 오프셋에 강한 심볼 동기 획득 장치 및 방법
EP09742859.3A EP2293506B1 (de) 2008-05-09 2009-05-08 Vorrichtung und verfahren zum erhalten einer gegenüber frequenzoffset robusten timingsynchronisation bei der zellensuche eines drahtlosen kommunikationssystems
EP20210584.7A EP3829128B1 (de) 2008-05-09 2009-05-08 Vorrichtung und verfahren zum erhalten von symboltaktzeitsynchronisation, die robust gegenüber frequenzversatz bei der zellensuche in einem drahtloskommunikationssystem ist

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EP09742859.3A Division EP2293506B1 (de) 2008-05-09 2009-05-08 Vorrichtung und verfahren zum erhalten einer gegenüber frequenzoffset robusten timingsynchronisation bei der zellensuche eines drahtlosen kommunikationssystems
EP20210584.7A Division-Into EP3829128B1 (de) 2008-05-09 2009-05-08 Vorrichtung und verfahren zum erhalten von symboltaktzeitsynchronisation, die robust gegenüber frequenzversatz bei der zellensuche in einem drahtloskommunikationssystem ist
EP20210584.7A Division EP3829128B1 (de) 2008-05-09 2009-05-08 Vorrichtung und verfahren zum erhalten von symboltaktzeitsynchronisation, die robust gegenüber frequenzversatz bei der zellensuche in einem drahtloskommunikationssystem ist

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EP4250623A2 true EP4250623A2 (de) 2023-09-27
EP4250623A3 EP4250623A3 (de) 2023-12-27

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EP20210584.7A Active EP3829128B1 (de) 2008-05-09 2009-05-08 Vorrichtung und verfahren zum erhalten von symboltaktzeitsynchronisation, die robust gegenüber frequenzversatz bei der zellensuche in einem drahtloskommunikationssystem ist
EP23186435.6A Pending EP4250623A3 (de) 2008-05-09 2009-05-08 Vorrichtung und verfahren zur erzielung einer gegenüber frequenzversatz robusten symbolzeitsynchronisation bei der zellensuche eines drahtlosen kommunikationssystems
EP09742859.3A Active EP2293506B1 (de) 2008-05-09 2009-05-08 Vorrichtung und verfahren zum erhalten einer gegenüber frequenzoffset robusten timingsynchronisation bei der zellensuche eines drahtlosen kommunikationssystems

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US (1) US8774122B2 (de)
EP (3) EP3829128B1 (de)
JP (1) JP5384620B2 (de)
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CN (2) CN105245481B (de)
WO (1) WO2009136753A2 (de)

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WO2009136753A3 (ko) 2012-05-10
CN102217264A (zh) 2011-10-12
EP2293506A4 (de) 2017-01-11
EP3829128A1 (de) 2021-06-02
KR20120083250A (ko) 2012-07-25
EP2293506B1 (de) 2020-12-02
CN105245481B (zh) 2020-05-05
KR101231512B1 (ko) 2013-02-07
JP5384620B2 (ja) 2014-01-08
KR20090117595A (ko) 2009-11-12
EP3829128B1 (de) 2023-08-30
US20110058528A1 (en) 2011-03-10
EP2293506A2 (de) 2011-03-09
WO2009136753A2 (ko) 2009-11-12
CN105245481A (zh) 2016-01-13
JP2011528515A (ja) 2011-11-17
EP4250623A3 (de) 2023-12-27
US8774122B2 (en) 2014-07-08

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